Vivo tipped to be testing a smartphone with up to 12,000mAh battery

That kind of a number would have sounded unrealistic not long ago, but battery expectations have been creeping up, especially among Chinese brands. Where 5,000mAh once felt generous, it is now the baseline. Phones with 7,000mAh to 8,000mAh cells are no longer unusual in China, and Honor and Realme have already shipped devices with 10,000mAh batteries, signalling that endurance is becoming a selling point rather than a niche feature. In fact, the Realme P4 Power recently launched in India with a 10,001mAh battery.

The reported Vivo test unit uses a 4.53V silicon battery. Silicon-based cells can store more energy than traditional graphite designs, which helps increase capacity without making phones dramatically larger. The trade-off is heat management, charging behaviour, and long-term durability all become harder to balance, which is why such devices often spend months in testing before they see a release.

The leak also hints at how Vivo may position these batteries across its lineup. The main flagship series is unlikely to reach 9,000mAh this year, but the performance-focussed iQOO brand could introduce a device with a 9,000mAh cell. In response to questions about Xiaomi, the tipster added that similar large-battery phones are being planned, though nothing has been finalised. If true, that suggests the push toward multi-day battery life may soon involve several brands.

Not every manufacturer is chasing bigger numbers though. Apple and Samsung have focused more on efficiency, using chip design and software optimisation to stretch battery life without increasing size or weight. Chinese brands have generally taken a more direct route — larger batteries paired with fast charging to ease concerns about running out of power.

For buyers, a phone that lasts two days instead of one changes how often you think about charging, especially when travelling or using power-hungry features like gaming and video recording. The downsides are just as practical. Larger batteries can mean heavier devices, thicker frames, and more heat to manage under load.

For now, Vivo’s high-capacity phone remains in testing, and there is no indication of when it might launch. Even so, for the industry as a whole, battery life is turning into a headline feature, and the definition of “all-day use” may soon stretch well beyond a single day.